With '--build-static' enabled, rdma-core is failed to probe by configure

[HuangShumin]

Please acknowledge the following before creating a ticket

• I have read the GitHub issues section of REPORTING-BUGS.

Description of the bug:
fio-3.37 cannot be built with static rdma engine, even with libibverbs-dev/librdmacm-dev static libraries installed.

Environment: Debian 12.5

fio version: fio-3.37

Reproduction steps

apt install build-essential devscripts dpkg-dev equivs fakeroot lintian quilt
mk-build-deps -i -r fio
apt install libnl-3-dev libnl-route-3-dev libibverbs-dev librdmacm-dev
tar xzvf fio-3.37.tar.gz && cd fio-fio-3.37
./configure --build-static && make -j $(nproc) && ./fio --enghelp | grep rdma
# shoud output rdma engine here

Troubleshooting
After I modify configure script contents as below:

##########################################
# See if we need to build a static build
if test "$build_static" = "yes" ; then
  CFLAGS="$CFLAGS -ffunction-sections -fdata-sections"
  LDFLAGS="$LDFLAGS -lnl-3 -lnl-route-3 -libverbs -lrdmacm -lrpma -static -Wl,--gc-sections"
else
  build_static="no"
fi
print_config "Static build" "$build_static"

configure is able to probe static library of rdma, but it's reported with undefined errors by gcc ld as

/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/12/../../../x86_64-linux-gnu/librdmacm.a(cma.c.o): in function `check_abi_version_nl_cb':
(.text+0x4fb): undefined reference to `nlmsg_hdr'
/usr/bin/ld: (.text+0x514): undefined reference to `nlmsg_parse'
/usr/bin/ld: (.text+0x54c): undefined reference to `nla_get_u64'
/usr/bin/ld: (.text+0x562): undefined reference to `nla_get_string'
/usr/bin/ld: (.text+0x594): undefined reference to `nla_get_u64'
/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/12/../../../x86_64-linux-gnu/librdmacm.a(cma.c.o): in function `ucma_query_route':
(.text+0x1255): undefined reference to `ibv_copy_path_rec_from_kern'
...

Anyone who cares about this issue? I would like building a static and portable fio that's indepent to Linux distro.

Best Regards,

[HuangShumin]

I just figure out this issue by static probe the libiberbs/librdmacm/librpma library, as below:

if test "$disable_rdma" != "yes" && compile_prog "" "-libverbs -lnl-3 -lnl-route-3" "libverbs" ; then
    libverbs="yes"
    LIBS="-libverbs -lnl-3 -lnl-route-3 $LIBS"
fi

File#configure#Line#1008

if test "$disable_rdma" != "yes" && compile_prog "" "-lrdmacm -lnl-3 -lnl-route-3" "rdma"; then
    rdmacm="yes"
    LIBS="-lrdmacm $LIBS"
fi

File#configure#Line#1027

if test "$disable_rdma" != "yes" && compile_prog "" "$(pkg-config --static --libs librpma)" "rpma"; then
    librpma="yes"
    LIBS="$(pkg-config --static --libs librpma) $LIBS"

File#configure#Line#1047

And I have pulled a request #1806 to fix this static build problem.

[vincentkfu]

Fixed by #1818